Episode 12, "The Ghosts of Britain"
Synopsis: The mystery of the Raven is about to be revealed as Holmes looks to root out the killer of Watson while Lupin and other parties converge on the hidden treasure. It all comes to a head when deductions are made, secrets are unmasked, and there are tense confrontations! Who will come out on top, the world's most famous detective or the world's greatest thief? Or will it be somebody else? The game's afoot!